Handheld sensor device



FIG. 1 is a front, left, and top perspective view of a handheld sensor device embodying the new design;

FIG. 2 is a rear, right, and bottom perspective view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a left side view thereof;

FIG. 7 is a top plan view thereof; and,

FIG. 8 is a bottom plan view thereof.

The broken lines in the figures are shown for the purpose of illustrating portions of the handheld sensor device and/or environmental matter and form no part of the claimed design. 

CLAIM The ornamental design for a handheld sensor device, as shown and described. 